Smtp Error Code 555 Mar 8, 2016. This is a basic guide to the SMTP return (or 'error') codes you may see for rejected or deferred messages in the Message Log of the Barracuda. Simple Mail Transfer Protocol (SMTP). Syntax error: 500, 501, 502, 550, 555:. and the SMTP receiver is configured to reject mail from such sender. 6

Many people have already pronounced 1.8” hard drives dead. However, constant capacity growth ensures this small form factor remains at least somewhat attractive. Flash memory, which is the logical alternative to compact hard drives, is.